pdf2djvu vs djvudigital
=======================

djvudigital, a part of DjVuLibre_, is another PDF to DjVu converter.
The list below outlines some differences between the converters.

Superiorities of djvudigital
----------------------------

-  djvudigital uses a `sophisticated layer separation algorithm`_.
   pdf2djvu uses a simple one.

-  djvudigital is typically much faster than pdf2djvu.

-  djvudigital can convert PostScript files, too.

Superiorities of pdf2djvu
-------------------------

-  djvudigital internally relies on a `Ghostscript driver`_, which has a
   license incompatibility issue. pdf2djvu is not affected by any
   license problem.

-  djvudigital cannot extract hidden text.

-  djvudigital cannot extract document metadata.

-  For some documents, djvudigital cannot extract document outline.
   See the `bug report`_ for details.

-  djvudigital cannot produce indirect multi-page document by itself.

-  djvudigital always uses lossless compression for monochrome images.

-  With djvudigital, there is no obvious way to convert only some pages
   of a document.

-  With djvudigital, there is no way to customize page identifiers.


.. _DjVuLibre:
   http://djvu.sourceforge.net/

.. _sophisticated layer separation algorithm:
   https://leon.bottou.org/papers/bottou-2001

.. _Ghostscript driver:
   http://djvu.sourceforge.net/gsdjvu.html

.. _bug report:
   https://sourceforge.net/p/djvu/bugs/109/

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